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-- 29 --
FACTORY
INSTALLED
LOCATION
ALTERNATE
FIELD
LOCATION
A00212
Fig. 32 -- Relocating J-Box
NOTE
: Use AWG No. 18 color-coded copper thermostat wire
for lengths up to 100 ft (30.5 M). For wire lengths over 100 ft,
use AWG No. 16 wire.
ACCESSORIES
1. Electronic Air Cleaner (EAC)
Two quick-connect terminals marked EAC-1 and EAC-2
are provided for EAC connection. (See Fig. 34.) These
terminals are energized with 115v (1.0-amp maximum)
during blower motor operation.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit
component damage.
DO NOT connect furnace control HUM terminal to HUM
(humidifier) terminal on Thermidistat
t
, Zone Controller or
similar device. See Thermidistat
t
, Zone Controller,
thermostat, or controller manufacturer’s instructions for
proper connection.
CAUTION
!
2. Humidifier (HUM)
A quick-connect terminal (HUM) and screw terminal (C
OM
24v) are provided for 24v humidifier connection. (See Fig.
34.) HUM terminal is energized with 24v (0.5-amp
maximum) when gas valve is energized.
NOTE
: A field-supplied, 115-v controlled relay connected to
EAC terminals may be added if humidifier operation is desired
during blower operation.
Step 9 -- Removal of Existing Furnaces from
Common Vent Systems
When an existing Category I furnace is removed or replaced, the
original venting system may no longer be sized to properly vent
the remaining attached appliances. An improperly sized
Category I venting system could cause the formation of
condensate in the furnace and vent, leakage of condensate and
combustion products, spillage of combustion products into the
living space, etc.
Step 10 -- Combustion Air and Vent Pipe Systems
GENERAL
Vent system or vent connectors may need to be resized. For any
other appliances when resizing vent systems or vent connectors,
system or connector must be sized to approach minimum size as
determined using appropriate table found in the NFGC
or NSCNGPIC.
The 58MCB can be vented as either a direct vent (all sizes) or as
a non-direct vent (except for 140 size) application. A direct vent
system shall be installed in accordance with the direct vent
(2-pipe) procedures in the following Combustion Air and Vent
Pipe
Systems
section.
For
non-direct
vent
(1-pipe)
applications, refer to the non-direct vent (1-pipe) procedures in
the same section.
Multistory and common venting are prohibited.
DIRECT VENT/2-PIPE SYSTEM (ALL SIZES)
In a direct-vent (2-pipe) system, all air for combustion is taken
directly from outdoor atmosphere, and all flue products are
discharged to outdoor atmosphere. A factory accessory vent
termination kit MUST be used in a direct vent (2-pipe) system.
58MCB